ICU-20083 Enable Address Sanitizer for ICU4C Build.

.travis.yml

@@ -11,20 +11,20 @@ matrix:
       compiler: gcc
       script:   cd icu4c/source && ./runConfigureICU Linux && make -j2 check
 
-    - language: cpp
-      env:      BUILD=ICU4C_CLANG
-      compiler: clang
-      script:   cd icu4c/source && ./runConfigureICU Linux && make -j2 check
-
     - language: cpp
       env:      BUILD=MACINTOSH
       os:       osx
       compiler: clang
       script:   cd icu4c/source && ./runConfigureICU MacOSX && make -j2 check
 
+    # Clang Linux with address sanitizer.
+    # Note - the 'sudo: true' option forces Travis to use a Virtual machine on GCE instead of
+    #        a Container on EC2 or Packet. Asan builds of ICU fail otherwise.
     - language: cpp
+      env:      BUILD=ICU4C_CLANG_ASAN
       os:       linux
       dist:     trusty
+      sudo:     true
       compiler: clang
       addons:
           apt:
@@ -33,8 +33,5 @@ matrix:
                   - llvm-toolchain-trusty-5.0
               packages:
                   - clang-5.0
-      env:
-          - BUILD=ASAN
       script:
-          - echo not yet
-          # - cd icu4c/source && CPPFLAGS="-fsanitize=address" LDFLAGS="-fsanitize=address" ./runConfigureICU --enable-debug --disable-release Linux --disable-renaming && make -j2 check
+          - cd icu4c/source && CPPFLAGS="-fsanitize=address" LDFLAGS="-fsanitize=address" ./runConfigureICU --enable-debug --disable-release Linux --disable-renaming && make -j2 check